Question

在处理java.lang.OutOfMemoryError时遇到问题：位图大小超出了VM预算错误。原始图片从不大于250x250px。并从drawable文件夹加载。我在互联网上找到了一些解决'inJustDecodeBounds'的解决方案，但我无法让它工作..有关如何解决这个问题的任何想法？这让我头疼了两天......

现在我正在通过我根据父宽度计算的因子来重新缩放图像..

@Override
    public View getView(int position, View v, ViewGroup parent) {
        View mView = v;
        this.parent = parent;

        if (mView == null) {

            LayoutInflater vi = (LayoutInflater) getContext().getSystemService(
                    Context.LAYOUT_INFLATER_SERVICE);
            mView = vi.inflate(R.layout.caa_xml, null);
        }

        ImageView image = (ImageView) mView.findViewById(R.id.iv_caarow);

        String name = getItem(position).getFile();
        int resId = C.getResources().getIdentifier(name, "drawable",
                "com.test.com");
        int imageWidth = (int) calculateImageWidth();
        // load the origial BitMap (250 x 250 px)
        Bitmap bitmapOrg = BitmapFactory
                .decodeResource(C.getResources(), resId);

        int width = bitmapOrg.getWidth();
        int height = bitmapOrg.getHeight();
        int newWidth = imageWidth;
        int newHeight = imageWidth;

        float scaleWidth = ((float) newWidth) / width;
        float scaleHeight = ((float) newHeight) / height;

        // create a matrix for the manipulation
        Matrix matrix = new Matrix();
        // resize 
        matrix.postScale(scaleWidth, scaleHeight);
        // recreate the new Bitmap
        Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0, width,
                height, matrix, true);

        BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);

        image.setImageDrawable(bmd);

        if (mView != null) {

            //additional code here

        }
        return mView;
    }

    private float calculateImageWidth() {
        // TODO Auto-generated method stub
        int parentW = parent.getWidth() - parent.getPaddingLeft()
                - parent.getPaddingRight();
        Resources r = C.getResources();
        float pxPaddingBetweenItem = TypedValue.applyDimension(
                TypedValue.COMPLEX_UNIT_DIP, 2, r.getDisplayMetrics());
        float pxPaddingInItem = TypedValue.applyDimension(
                TypedValue.COMPLEX_UNIT_DIP, 10, r.getDisplayMetrics());

        int totalImageWidth = (parentW - (int) (3 * pxPaddingBetweenItem) - (int) (8 * pxPaddingInItem)) / 4;
        float imageWidth = (float) totalImageWidth;
        return imageWidth;
    }

Answer 1

问题是，您使用旧的大位图创建缩放的位图。之后，你的内存中有两个位图，你甚至不回收旧的位图。

无论如何，还有更好的方法：

ImageView imageView = (ImageView) findViewById(R.id.some_id);
String pathToImage = "path";

BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(pathToImage, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;

// Determine how much to scale down the image
int scaleFactor = Math.min(photoW/50, photoH/50);

// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bmOptions.inPurgeable = true;

Bitmap bitmap = BitmapFactory.decodeFile(pathToFile, bmOptions);
imageView.setImageBitmap(bitmap);

修改

如果要使用资源ID而不是文件路径，请使用decodeResource并执行最后一部分，如下所示：

Bitmap bitmap = BitmapFactory.decodeResource(getResources(), resourceId, bmOptions); imageView.setImageBitmap(bitmap);

希望这段代码可以帮助你！

使用图像加载gridview时的OutOfMemoryError

1 个答案: